A series of self-matting waterborne polyurethanes (WPUs) were successfully prepared by introducing hydrophilic units into both soft and hard segments. By employing a polycaprolactone polyol containing carboxylate groups within the polymer chains to provide hydrophilicity directly, the matting performance of WPU films was greatly improved. The chemical structures of the WPU resins were confirmed by FTIR spectroscopy, and the morphology of WPU films was observed by SEM. The parameters of WPU preparation were investigated in detail. It was found that the surface gloss of WPU films as well as the particle sizes of WPU dispersions were closely associated with the content of hydrophilic units. As the content of carboxylates or sulfonates increased, the particle sizes of WPU decreased, while the gloss increased gradually. When the particle sizes of dispersions were greater than 3 μm, the gloss of WPU films coated on a leather surface was lower than 1. The results of TG showed that, the initial decomposition temperatures of WPU films were higher than 280 °C, which indicated these films also had good thermal stability. The prepared self-matting WPU coatings would have potential application prospects in the field of leather finishing.

中文翻译：

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环保型自粘水性聚氨酯涂料的合成与表征

通过将亲水性单元引入软链段和硬链段中，成功制备了一系列自消光水性聚氨酯（WPU）。通过使用在聚合物链中含有羧酸根基团的聚己内酯多元醇直接提供亲水性，WPU膜的消光性能大大提高。通过FTIR光谱证实了WPU树脂的化学结构，并且通过SEM观察了WPU膜的形态。详细研究了WPU制备的参数。发现WPU膜的表面光泽以及WPU分散体的粒径与亲水单元的含量密切相关。随着羧酸盐或磺酸盐含量的增加，WPU的粒径减小，而光泽度逐渐增加。当分散体的粒径大于3μm时，涂在皮革表面上的WPU膜的光泽度低于1。TG的结果表明，WPU膜的初始分解温度高于280°C，这表明这些膜还具有良好的热稳定性。制备的自消光WPU涂料在皮革涂饰领域将具有潜在的应用前景。